GLC2400/2500/2600 Series User Manual
2–7
Chapter 2 – Specifications
Pin Assignm e nts
Pin No.
Signa l
Na m e
Signa l
Dire ction
Condition
1
CD
Input
Carrier detect (RS-232C)
2
RD
Input
Receive data (RS-232C)
3
SD
Output
Send data (RS-232C)
4
ER
Output
Enable receive (RS-232C)
5
SG
Signal Ground
6
DR
Input
Data Set Ready (RS-232C)
7
RS
Output
Request Send (RS-232C)
8
CS
Input
Clear send (RS-232C)
9
RI/VCC
Input/Outp
ut
Ring Indicate (RS-232C)
+5V+5% 0.25A
Expansion Serial Interface
This interface is used for RS-232C data transfer, and uses a plug-type connector.
Pin #9 (VCC) DC 5V Output is not protected. To prevent damage or unit
malfunction, use only the designated level of current.
5
1
6
9
•
This GLC unit’s serial port is not isolated. When the host (PLC) unit is
also not isolated, and to reduce the risk of damaging the RS-422 circuit,
be sure to connect the #7 SG (Signal Ground) terminal.
•
Pin #14 (VCC) DC 5V Output is not protected. To prevent damage or unit
malfunction, use only the designated level of current.
Use the following instructions to create your own cable:
With an RS-422 cable:
•
The following pins must be shorted as follows:
#18 (CSB) <—> #19 (ERB)
#21 (CSA) <—> #22 (ERA)
•
Connecting the RS-422 cable’s #9 (TRMX) and #10 (RDA) pins inserts a
termination resistance of 100
Ω
between #10 (RDA) and #16 (RDB).
•
When making a cable for a Memory Link system, use a 4-wire type cable.
With an RS-232C cable:
•
Do NOT use the following pins:
#9 (TRMX), #10 (RDA), #11 (SDA), #15 (SDB), #16 (RDB), #18 (CSB),
#19 (ERB), #21 (CSA), #22 (ERA)
•
Connect the #1 (FG) terminal only if it is required by a connected device.
Recommended Parts
Connector
Dsub 9pin socket XM2D-0901
(OMRON)
Cover
Dsub 9pin cover XM2S-0913
(OMRON)
Jack Screws
XM2Z-0073
(OMRON)
Use inch type set screws (#4-40 UNC).